For the last few hours, I've been trying to collect all the platinum medals and artifacts from the levels I've already beaten. I may owe an apology to Republic Heroes' story. As bland and forgettable as it is, playing these levels with no story at all has been an exercise in endurance.
It's not even as if the game is notably bad, it's just an action-platformer that one can play on mental autopilot. Sometimes, as I button mash my way through hordes of enemies or make perfunctory button presses to leap from sticky platform to sticky platform, I feel as if the game is playing me.
I've almost come to love the times when the game's controls fail. It never leads to anything particularly disastrous, just the occasional swinging at air or leaping into a pit and then immediately respawning, but it does remind me that human input is still, technically, required (I'd say that it gives me a feeling of control, but the imprecise controls rarely mirror my intent).
I think the trick for finishing this game in a timely fashion is to just enter a trance-like state, where my mind is disconnected from hands and I can, I don't, contemplate the nature of the universe or some shit, while the game basically plays itself. It sounds easy, I just have to find the motivation to sit down and actually do it.