Thanks for playing and good to hear you liked it!
About the issues you found:
1) There is a slight variation of the jump height depending on the length one plays the jump button. Did you notice that? If you did not, then that might be one reason why the jumps felt too difficult. Originally I was planning to have more platforming challenges in the game in addition to the puzzles and that's why I tried to add more possibility control the height of the jump. But if that made jumping more difficult I maybe should have not kept that and instead have the jumps to be always max height.
2) Sorry about that. That sounds like really weird bug and I have no idea why that would happen. Thanks for letting me know. This is something that I have to investigate more. Hopefully I will be able to figure it out and prevent others from experiencing the same fate.