I love the art style. it’s outstanding and the game feels very polished, especially for a game jam.
I was a bit confused at the start about how to proceed and took a few moments to realize I need to press A/D buttons. I also expected the mouse to help with aiming, but it doesn't seem to.
Another area for improvement might be the game economy, it took me a few rounds to gather enough materials for the first upgrade. Also, It would be great if the UI clearly showed whether I’ve collected enough items for an upgrade.
Really nice game overall, keep up the great work!