It's cool in concept and when it's slow at the start.
But yeah, quickly came to realize the optimal way to play is to mash the cycle and shoot keys. It's almost like a plottwist where the game that looked like a tactical survival game reveals itself to be a high-action shooter, it's kinda funny.
And by the time the difficulty's high enough, it comes down to your endurance against the enemy spam.
It's not bad in itself for the game's short playtime, just not that interesting for the balance and gameplay loop.