Hmmm, this unfortunately felt pretty rough for me: feels like an incredibly early prototype or alpha and certainly not anything ready for public release.
The biggest issue for me was the flamethrower, it that it doesn't feel like a flamethrower at all. Sure, it lights up the environment all fancy like, but the enemies don't catch fire and don't suffer damage over time and don't panic spread it around to fellow enemies, there's no patches of fire or scorch marks being left over on the ground, and the fire jet is very static and stiff when it should be a cool burning snake of flaming oil that trails/lags behind as you swing it around. For me, it felt more like a lightsaber: you extend it out and swing it around hitting things, and then retract it. Reminded me of spamming the laser shot in NES Contra to make a lightsaber-ish weapon.
The other issues were that the game felt very bland. All of the menus and title graphics are very blank text with no reactiveness, the enemies are dumb sponges with no exciting variety and no pathfinding so they get stuck and easily exploited, and the game is just a bog-standard horde shooter with no events, goal, or interesting upgrades/progression beyond just number statistics.
It certainly could be pretty cool: I'm always down to roast some aliens, especially with a flamethrower, and the whole system of one item being ammo, health and upgrade points all-in-one so you need to balance it, could be quite interesting. But I feel like it needs a lot of work to get that cool arcade action going. Most likely a jam game so I'm probably being overly harsh, but what can I say, I'm really picky about flamethrowers!