Good entry! The core loop has potential for further development (and your's game description only confirms this). Build up the robot was quite fun, but I think the difficulty curve is a little off. Level 3 was way harder than level 4 (mostly bc level 4 has limited space, while 3 have too much of it). If you can add more mechanics and a "reward feeling" for the end of the level (maybe something similar to dialogues in Helltaker), then you have a ready-to-go product for games store.