Thanks for your report ! : I tested the game and I can confirm you're right : same "missing text" issue with canoe. I tried some quick "magic" preset ID like 6810, but no change here. I suppose this type of issue should be not too hardly to be fixed, hopefully someone could do this one day.
However, concerning retroarch, I tested the game with absolutely none issues at all. But, I used (in my opinion) the most reliable and simple version of hakchi + retroarch that was never made for the SNESC and for SNES games experience : the old 2.21f version + retroarch 1.0 (and snes9x2010 core) : works just fine
Thanks for your reply. SNES9x10 runs almost fine for me, but there is one pretty demanding?! level (the one in the woods with the skeletons: first (when starting game) talk to the kid to the right, go to the sandpit, obtain the beam, go north to the broken bridge and repair it, talk to the kid (I think it was the kid or the sign in front of the wood) up further north and go right in the woods, the level straight ahead).
Thats where i have sound issues (crackling) when running SNES9x.
Canoe is struggling too, (sadly I can´t test it on the original hardware, because I lack a proper TV

, but I think it would be the same), especially while the sounds of the skeletons are audible and you shoot (you aren´t able to hear the sound of some shots).
Haven´t played further on SNES9x10 yet, beacuse I am pretty ill at the moment, but I will play through it, maybe next week.
But I can imagine that there will be some issues when obtaining the weapon with the projectiles which follow the enemies (can´t remember the name). There were several slowdowns because of it last time I finished it with Canoe (But I think thats just normal).