I wasn't sure what to make of the ammo system at first, but the more I think about it, the cleverer it is. It's a really good way of letting you enjoy having some decent firepower without letting you be a juggernaut, and it combines really well with the healing system to make a game where it's expected that every so often, you'll need to retreat and resupply.
That aside, this is really impressive - the visuals especially. I look forward to any post-jam updates you have planned!