Pretty fun game. Music's a bit quiet but the SFX make up for it. The simple art style is also really nice. I also liked the concept of needing portals to warp and the key being in both dimensions.
The controls are a bit weird though. Right click to use portals and left click to pick up/drop blocks is fairly unintuitive. Keyboard keys for those would feel more intuitive.
Other than that, the game's great!