First off, I appreciate the high praise, and the bug report. And I'm sorry that you ran into that bug. It would've made me furious to be unable to finish a hard run right at the end.
Can't believe I missed that bug during play-testing. Must've messed up the map's import sometime after the last time that I playtested that route. Looking at the code for the map, it doesn't take a programmer to see that that specific tile is messed up lol. 
But the fix was easy enough to make, and I've pushed it up under the new version 1.2.3 build.
As for the door on the right, that's just there for fun. I never intended for it to end up as a malicious taunt to the player after getting soft-locked by that broken tile glitch. Funny how things work out like that.
Lastly, as a bonus, I'll divulge that I've been working on a huge expansion pack to the game. With 2 or 3 more areas, way more cards, and 3 completely different card archetypes, each with their own unique mechanics. I really fell in love with this game while I was making it, and I just had to return to it. No idea when it'll be done, but sometime in 2026 is the goal.