Not the most original idea but it was implemented pretty well. It had smooth gameplay and it can be a fun timewaster. I'd recommend some refining the tile placement, water fountains are usually attached to a wall or a column with impassable terrain, and it would be a good idea to disable player movement after death. If you are planning on working some more on it I would consider adding the option to upgrade projectile size and rate of fire. I would also consider a dodge cooldown that can be reduced if you insist on not adding any more attacks/spells. All in all, it is a good game, especially considering it is your first Jam.