Nice game, simple and easy to pick up up boxes I like. Increasing difficulty be good, but like you said 3 hours is not much. With footsteps you could try randomizing the pitch slightly to create a different tone. Good work.
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Thank you! If I had had more time I would've looked for a decent sound pack and randomized the sounds, but I had like six minutes left so I just pressed buttons on Bfxr a lot of times until I had something acceptable. Sound design is definitely something I will work on when thinking about possible future updates.