It's a very fun mech action game. Felt pretty balanced in terms of difficulty, aside from the earlier bosses feeling spongier than the later bosses.
The AI on the lower difficulties isn't too advanced, so you can get by with strafe jumping, firing the gun and the missiles and using the dash for offense or defense as needed.
Train boss was fun, as was the final boss. Seemed like they were less spongy than the earlier bosses, and no enemy minions made it easy to focus the gun, the missiles and the assault dash on them.
It'd be fun to see a later version with customizable mech loadouts for parts and weapons like in Armored Core, but this game is solid as it is.