I tried playing this game last night, but the gamepad controls were so awkward and you can't change them. (like Sqaure isn't normal attack and you can't use the d-pad in the menus). It was super disappointing. Maybe I'll try again with the kb+mouse controls instead.
I picked this game up from this quick look and I don't think it plays as well as Ben thinks. It has some awkward hitboxes (spikes especially) and the grapple hooks auto target surfaces in weird ways sometimes. The level design can be rough. The area where you get the shurikens has a point where you basically flip a switch by an locked door and it opens a door on the other side of the map which has a switch that opens the locked door where the first switch was.
Also I got to that slime boss maybe a bit earlier than Ben did? Or at least bought different upgrades since I each little slime takes 2 hits for me and I did buy the charge sword yet. Unfortunately the game saves right as you pick up the SMGs and the boss seems beyond my ability due to not happening to get the damage and charge upgrades. I've essentially softlocked myself as I leave the area without fighting the boss.
D_W's comments