I think I made it to the end, and man this game has some really cool stuff but I think it suffers terribly from relying on references (which to be fair is something I've been guilty of too).
For starters, as someone who is unfamiliar with both Undertale and Plants vs. Zombies, figuring out what I was supposed to do for both those levels was a bit rough. I tried clicking on the buttons in the Undertale section and they did nothing, and though I figured out what I was supposed to do, dodging all the obstacles was quite the gauntlet. And with the Plants vs Zombies level I didn't know what each plant type did so it was trial and error for a bit, but failing in that level is very time consuming as there's no "restart level" button. I just had to kinda wait there for a minute as a zombie slowly walked across the screen.
While these were pretty interesting levels, and I imagine really cool for fans of either game, it was really disorienting for newcomers. The pong section was fun, I imagine it wouldn't suffer from the same lack of familiarity as the other sections. Didn't for me anyways.
Aside from that, I like the concept of a game falling apart, and the visuals were all well done.
Good work!