I really like your submission! The tracks feel varied but still like they are from the same game. <3
I think you have the right amount of instrumentation going on. The reason it can get a bit repetetive is just that the instruments vst's themselves maybe aren't the hightest quality, but that is the smallest problem, so dont worry about that. And maybe vary the harmony itself some more, like different voice leading, inversions, change the texture a bit, stuff like that. You can do alot with not that much, and I really enjoyed yours!