Also another suggestion for your LP series , I think could be to do a comparative let's play of the first rank of Revenge of the lemmings v1 ( it's for Lemmini ) , and the first rank of Revenge of the lemmings v2 (  it's based on old formats Neolemmix , but it has been released as standalone ) .
The first rank of v1 became more  difficult quickly . In comparison ,  the first rank of v2 was much easier ,  but that was because v2 had a new rank between the second and the third rank ( and it had also the bonus rank of v1 removed ) ,  so several of the levels that existed in the first rank of v1 , moved to the second rank , and became replaced by easier levels ( several of these new levels were easier remakes of levels you would encounter in later ranks ) .

EDIT :  Also , unfortunately only one of the pack that I have suggested is for Neolemmix ( Rotl v2 ) , so if you feel that my suggestion is "out of topic" for your LP series ,  plese ignore it .

Thank you guys!

I downloaded OBS studio , and it did perfectly the job! Also the performance was great in the level I have recorded ( it didn't struggle at all).

So here is my first video ("Reachable Heights" , Neolemmix version) :

https://www.youtube.com/watch?v=pzDtp7ShVDQ

I have uploaded updated versions of the following levels :


Bubble Bath + Is There a Pilot in the Rocket (v 1.01 for both ) : Removed the time limit

Shadows in the Sky v1.01 : Added 2 extra blockers/bashers/diggers

FC Lems screwed by the refs v1.04 : Added 1 extra blocker/basher/digger as pickup skills

Played through the levels and I say they are all 100% community pack worthy.

I attached my solutions.

Some feedback:

Bubble Bath + Is There a Pilot in the Rocket _: I would remove the timers here as they provide nothing to the solution. Otherwise those classics are still fine.

FC Lems screwed by the refs + Shadows in the Sky: Excellent levels!   I only thing I would change here is giving them both 1 or 2 extra blocker+digger+basher. I don't think this will result in backroutes and it does not punish minimal different solutions that use a digger instead of a blocker somewhere. Especially as the levels can be a bit longer and users may have to redo the whole thing because of that (happened to me as well ).

Reachable Heights: Very nice level again, but I have skills left over it could be a slight backroute.

The Crystal Coves + The Space Outpost: Nothing to complain here, these are nice levels.

Thank you for playing the levels!

Your solutions are intended , or acceptable alternatives!
"Reachable Heights" is a relatively "open ended" level in terms of it's solution. Your solution has only some small differences compared to the intended one, so it counts as intended too.
Also  your solution for "FC Lems screwed by the refs" is an acceptable alternative.

Also , about the changes you have suggested , I can implement them. I will upload (probably tomorrow) , updated versions of the levels , which will implement the changes , you have suggested. For  "FC Lems screwed by the refs" and "Shadows in the Sky" , how many extra blockers/diggers/bashers , would you suggest me to add?

I have uploaded the 1.02 version of the ''FC Lems screwed by the refs " level . Most of the skills that are needed in order to solve the level , are now pickup skills.

I have uploaded the 1.01 version of the ''FC Lems screwed by the refs " level. I have added some owws on that , that fix a backoute , that I have found.

Have you run the "Validate Level" command in the "Tools" menu in the old Lemmix editor?  There are certain things like non-multiples-of-8 x-positions for objects, and other cases with objects (x,y) very out of bounds, that might be tolerated by Lemmix editor but definitely less so by the original game engines (eg. Customized Lemmings in DOS).  It's unclear how CustLemmix might handle those cases.

Try to see if you still run into problems after addressing all the issues found by "Validate Level".

Thank you for your advice!

I checked both levels with the "Validate Level" tool , and for every affected object , it gives me the message  that "the object is not a multiply of 8" , so it is obvious that it has to do with the x positions of the objects , not being a multiply of 8. Now that I know what causes the problem , I will see what can I do to fix it.