Downloading right now, gonna test it with:

Pentium II 200 MhZ, 64MB RAZM, 64MB KyroII GfX.

EDIT On that computer it wouldn't run at all. On my other PC it runs at 45 FPS. Specs:

Pentium IV 1,7 GhZ
256 MBRAM (SDRAM)
256 MB Radeon 9600XT

And how to move though the level? WASD or the arrow keys don't work.

EDIT 2 When trying to switch Level1.x and Level2.x the whole thing became messed up: the level suddenly looked like this.