Wow! I'm glad you liked it so much! Actually, it is the first puzzle game any of us have ever made or worked on.
We did find the bug in level 20, but only when it was too late to fix it, so sorry about that. There is a skip button, however, on the top right for if you want to try the next level since its impossible to complete it and get to the next one "legally".
We did find the rotator bug earlier but my attempt at fixing it ended up creating more problems than it was fixing (stopping the you from rotating when you should be able to) so we opted to just leave it and let the player reset if they get stuck.
Finally, the crossbow was quite a pain. The way I implemented the arrows could have been done much better with a raycast of some sort, together with an arrow effect, but for some reason I physically created an arrow, gave it a speed, and then waited until it collided into something to allow the player to move again (outcome of coding under pressure I suppose). We should have also made the amount of moves left until the bow fires much more obvious but we couldn't really come up with a way to do so while still looking visually appealing, so we decided to go for aesthetics over making it easier for the player (which was not a great idea in hindsight but oh well).
Anyway, thanks for the review and for playing our game!
P.S. If you do end up playing the levels after level 20, keep in mind that level 22 is slightly broken (still very much playable but easier than it should be) and level 23 is pretty much completely broken (completable but very buggy). 21 and 24 do work, however.