Problems...
Ok, I'm going to try this game again, though I've already noticed problems... Ok, in level 1, the player can just hold the jump button and hover over most things (except grenade explosions). In level 2, I got the five keys, and after the player walked past the restroom, the scene back to the outside and level 2 started over again, but I already had all five keys and couldn't progress.
The character movement is extremely slow, and this definitely needs to change. You might also want to add a key-sensitive jump; the longer the button is held, the higher the character jumps. Additionally, please add walk cycles and different frames of character animation... the character was totally static, and it was a huge detractor. Your voice recording needs a lot of work, as was very subpar. Don't slowly fade in the text, it's quite frustrating... or, if you want to keep the fade, allow the player to press a button or click the mouse to show the whole lot. The instructions for level 3 were way too small to read, I had to zoom in to read them. I couldn't get past that level, because the wall detection was too sensitive when things got real narrow that it seemed impossible to pass that point.