Nice Game! It has that feeling of progression that we love from these games.
Some feedbacks:
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It wasn’t immediately obvious that I could fight other units, and so my first life was spent running away surviving, haha. But once I discovered that I could fight enemies, I started getting upgrades.
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I think an indication that I’m supposed to drag an upgrade onto my character could be useful, but the interaction of dragging it on feels great otherwise.
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Also I think a way to remove parts could be useful, especially if I run out of available room for an extender.