Steam: https://store.steampowered.com/app/2124120/SULFUR/
Soundtrack : https://store.steampowered.com/app/3025640/SULFUR_Soundtrack/?snr=1_5_9__405
This is flicker; not exactly known for its self-defense capability, but with a bit of modification, it could be worth sparing a slot in your backpack. Several players discovered they could slap a scroll of explosion on it, then blow up any walls that hide all the secret rooms. This will help you save up on the more traditional explosives, and direct them to those more in need