Whoops, seems I accidently deleted the qualifying part of that statement, to clarify:
When making angled lines to turn a vertically shot ball 90 *, and adding a line to keep it from gliding further up than wanted, sometimes it would get stuck in that corner, and others it would work as intended, if nothing was changed(like, for two individual levels this happened, while in other levels is always worked). Though to be fair, it probably can't be fixed since lines are not straight + slight variance in physics simulation is to be expected. To illustrate:
Also, there was a time where the ball reached the exit, but flew off the cube instead of entering the hole. Though to be fair, it counted it as a win and moved me to the next one. Besides that, there's mostly cosmetic oddities which didn't affect the puzzling,