This must be a hardest Run'n'Gun game I ever play in this planet.
Overall looks great, same as playing a Contra (more like the first Contra and Super C) but a lot harder than Contra.
But I have to admit, even I play a lot of retro style Run'n' Gun but this on is so hard. Especially the last boss.

Buy it if you like Contra or retro style Run'n' Gun games, this game is really worth for you

PS. I like the soundtrack of Final Stage, that's remind me of Super C's stage 6 soundtrack.