Okay, I know and I've heard you all, and I'm very sorry for leaving these stupid bugs...
After all as a almost solo dev sometimes some stuff just gets unnoticed!
Here's what is new in 0.1.9b:
[list]
[*] [b]Fixed all pressure plates[/b]. This means that Photons and matter is now working
[*] [b]Fixed all Slime spawners[/b]. Slimes will now properly leave pipes
[*] All fixes from main branch of the game and all improvements are in the prologue now
[*] Coins now collect automatically if they somehow leave the map
[*] And this time I actually did an extensive testing to ensure the quality of this build!
[/list]