i liked the game, it's very juicy and consistent with its monochromatic graphics, but i felt it's quite hard to get into. the movement was difficult to adjust to. the hover from shooting down helps, but the reload is very slow at the beginning and it leaves you defenseless against the enemies, which have the unfortunate tendency to bump you from offscreen at sonic speeds. i think it would help by a lot if the player started with some cash money in the pocket.
i probably wouldn't have been able to get very far without cheesing near the shop for reload with invincibility and shooting some off-screen point that gave me insane combo until i could get the passive damage ring upgrade, which helped mitigate the surprises. even then, the game gave me an F after i almost completely emptied the two shops that i've seen (thanks for the cute little cameo, by the way!)