Really intuitive "tutorial", introducing concepts one-by-one and leading right into the first "actual" level very nicely.
Simple but nice and consistent graphics!
The controls are a little unintuitive at first (I tried WASD, and kept accidentally pressing space to jump), but it works out. The control hint overlay is nicely done and prevents that from being too much of an issue.
On the first level with the movable block, I pushed it against the laser and trapped myself. Took me a minute or two to figure out how to pull it, almost closed and reopened the game.
I wish there was more of the timing stuff like the last level, mixed with the puzzles.
Overall, very fun! Took around 10 minutes total. Would definitely play more levels.