I really do like the idea of switching weapons to defeat different enemies. The control scheme though could use improvement as I kept pressing the space bar instinctively to try to either jump or shoot. I will say the w key was a good substitute for jump that just needed time to get used to but I would've definitely consider having the shoot command be located on the space bar and the switch command on the s key or have it be a different key instead. I would go and look at other 2d platformers and pay attention to their control schemes and try to find the similarities as that will give you some insight as to what players are normally used to for controls. As a minor point I do think the jumping could've benefited from having some level of input control to determine how high you jumped. Overall though I do think there's quite a bit of potential here and I do want to say good job completing it in time for the game jam.