Great work on this! I wish the sword and shield modes had more usefulness- unfortunately the gun is simply way more powerful; with only a couple of upgrades, you can pretty much just walk forward and not worry. Also, the bombs are very very powerful - I wonder if enemies killed by bombs should not be able to drop bombs as this made it a perfectly viable strategy to just bomb constantly and pick up new ones as enemies are killed by it.
Nevertheless, a fun sidescroller!