Hi, good game!
I enjoyed the richness of levels and the level design, especially with such a little amount of time to develop. Two small suggestions if you plan to return to the game to improve it:
1) Sometimes when you start climbing a stair the sprite gets teleported in the middle.
2) When entering in a door the camera teleports, it would feel more fluid with a small transition to the new position.
Anyway, good job! I also appreciated the Linux build, since I'm currently on Linux.
If you want, come to my entry and give me a feedback :D