Found this one pretty addicting. Ended up beating it on my fourth go and immediately going into endless mode. Kept playing until DVD reached a nice cinematic 1FPS, and I'd do it again! Great job!
One thing I did notice that I wasn't sure if it was intentional or not: at some point during my third run it stopped letting me pick increased XP gain on level up. Like if the option showed I could click it and a sound effect would play but nothing happened. I'm wondering if the XP gain upgrades persisted between runs or something, early levels in my fourth run did seem pretty quick.