Fun game, but the difficulty curve was a bit steep. The variety of enemys was a good way to change up the gameplay over time. The only thing I would say is to change/add the shop button, as I found using 'B' was a bit annoying and would have preferred Q/E/Esc. Adding a few small details such as an effect for the piercing upgrade and enemy deaths would be a good way to start for a post-jam version. Overall, quite an enjoyable, but challenging game.