This ones a lot of fun, with a nice simple concept and good visuals/music!
The main flaw here is the bugs,
-Level 3 can be beaten by placing a single block 2 tiles to the right and 2 tiles up of the cliff edge.
-You can clip the player out of the map by placing blocks on top of him before pressing the play button.
-Using the clipping bug you can beat level 5 without starting the level.
I had fun with the base game, and discovering these was fun but thought I should mention them.
Overall fun game!