cerebraldatabank.neocities.org
One tip: make sure the player does not jump too high otherwise it would be easy.
Yes, I have noticed that... problem is, reducing the player's jump speed by even 0.1 might render some levels impossible! Some levels are exactly calculated to be just at the player's limit, as it says here: https://cerebraldatabank.neocities.org/blog/game_hub.html
You used skew for the button on the barcode.html right?
Also that is coded really badly
Yep