I'm sure you will be able to publish a successful game on steam if you keep doing stuff like this! This is one of the cooles gamse I've seen in a jam.
If I had to give some feedback I would add a visual sign of where the soldiers will appear on screen, like a range or area, also for the thunderbolt, sometimes I don't know where things are gonna fall, and which enemies they will attack. Also the birds are so hard to kill when I don't get any archers or thunderbolts.