I can't figure out how to get past the first door. Maybe some written instructions could help :)

I liked how the light revealed the level. You could use polygon colliders for the spikes instead of box colliders. It was hard to jump over them when the colliders where square whilst the spikes were triangular.

Cool game Gerox - for other players - you left click on the purple door to go through it. Clicking on the red and purple buttons will give you a reward at the cost of some health. I had a little trouble navigating between screens sometimes but after jumping a bit was able to figure it out. One minor thing is that I think your jump input detection (spacebar) makes it to where if you are touching a wall you don't fall down. Not sure if this is intentional.