If this is your first GameJam game then please never stop making GameJam games :D
It was awesome. I've seen a lot of this 2D-3D shifting games out there but the execution on this one is great. Didn't really find the theme in it for "only one" because the "only one perspective at a time" feel like a bit of a stretch. But all in all the game was great, lots of "aha" moments in there that made me want to play more. Although the last puzzle was a bit confusing on how the hell did I get to that last platform. Also on my first try I managed to get out of bounds and after a while ended up in an empty void so had to reload the game.
Bugs aside it was a good experience! :)
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Thats really confidence building thank you so much! Yes the last one was to teach you more about the Orange blocks behavior in the 2nd Dimension, they sort of override the 2nd Dimension by applying Depth (hence why you cant move past them even in the 2nd Dimension).
if you spatially position yourself via the 2nd Dimension, in "Front" of a Orange block, you are actually in front of it - due to depth they add which, the 2nd Dimension doesn't have. So you hit it when returning to the 3rd Dimension (Isometric Overview) and because there isn't anything below you now (in the 3rd), you fall down.
God thats difficult to explain (could even be illogical), wish i had more time to develop and teach the player these consequences and rules slowly but I had to squeeze everything down to the most interesting things I could find and fast. I will do better next time!