This game was recently added to Galloping Ghost Arcade's floor, and my good friend and fellow GGA player Dr. Sage and I both started learning it. If you'd like to check out his no death run, it can be viewed here: https://www.youtube.com/watch?v=izlUzyxQvCY
As noted in his video, the game has emulation issues and crashes about 80% of the time if you die in level 4 or 5. Because of this, learning this game basically means you basically have to plan to no death run it. The game is pretty memorization heavy, with lots of "gotcha" moments to catch players not familiar with what's coming ahead. Other than that, I found the game pretty fun and will be looking into learning the sequel "TH Strikes Back".
If you'd like to check out the games' intro (I skipped it before loading a credit), I added it to the end of this video after the run is completed and the ending has played.
This gameplay was recorded with wolfMAME v.224 using default settings. As with all my runs - no TAS (tool assistance), cheats, hacks, or save states are used. INP file available on MARP (I'm in 2nd place): http://replay.marpirc.net/r/thoop