I like the shop and I like where you're going with the mode7 stage. On my first attempt to get to the mode7 stage - right before the boss would've appeared I got hit by an enemy, damage boosted through a wall, and got soft locked outside of the play area. I'm going to guess that there was some knockback that pushed the player ship by a value larger than the width of the collision mask on the wall sprite and you could fix it by either increasing the size of the wall's collision mask (easy) or putting together a raycast system for collisions (less easy).
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Ah dang it. Happened to me too. Only at the boss what the hell. I am definitely going to add tile collisions instead later for more robust collisions. I do cover the whole area with collisionboxes. Stretched though I think I may know the issue. Thanks for playing Z one more time. I hope you liked the Jazzy shop melody ;)!