F to change dimensions with WASD feels bad. I had that problem making my game too, so i switched to right click on mouse.Love the gameboy-like art and i like the physics. Though because of the difficulty I would implement infinite lives.
Thanks for your feedback! I chose the F key for changing dimensions because it's close to WASD and easy for me to press it quickly. Personally I found the game to be easy maybe because i made it :)