Phahahaha, as a native speaker, this is a great way to put our horrible grammar rules to great use :D I believe it would be better if the example sentences didn’t often include the correct article already, e.g. “Der Baum ist gross”, or “Die Lamp leuchtet schön”.
Also, I clearly need a toggle for Swiss German orthography, as our Country is scared of ß :P

An interesting concept, but there’s not enough time to read the worlds/examples and while also playing the game, this is compounded by the inability to stop moving.

The web version has some performance issues, but after changing the configuration to use WASD it was still playable. I think when using the mouse it doesn’t reset your velocity when you release, so you have to click again to stop otherwise you just keep moving in the same direction. I like language learning games, and this is a lot more fun than using flashcards, and could be expanded to cover other topics too. Despite the low framerate, the visuals and particle effects are also very nice. Pretty happy with the chain I managed to create:

I tried the Windows version. It runs, although at a very low framerate. And then it crashes to desktop after a few seconds.