The art is great and the game definitely has juice - I really like the wave title, the ui and the sprite work, and the enemies are cool, and it was a smart move to make a wave based game for a jam.
On the other hand, there's no music or sound effects to amp it up and make it more exciting, and for me, clicking LMB repeatedly is very tiring - could definitely be a hold-to-shot instead.
One thing I noticed is that I believe the character is walking faster diagonally, you could add .normalized() to the input vector to fix that. Also, the character speed could be a bit faster too.
Really good job on your first game!! Congrats