This was wonderful! Love House of the Dead (lots of fond memories of pretending to play it in arcades growing up) so felt right at home here :)
Shooting the boxes works really well as a mechanic here - they're tough enough that taking time out to destroy them feels like a risky tradeoff vs just trying to kill enemies, but so worth it for the chance to get more bullets.
The game feels very well paced, with a nice range of enemies (great use of the glitch monster here!). Difficulty was perfect for me, managed to beat it on my second run :)
Love this use of the assets too - was really cool to see them used in a 3d environment!