It would be fun, but too much balancing needed.
1. Progression is very non-linear - you beat 5-7 stages easily just to stumble on one, that requires heavy grinding to complete.
2. Encyclopedia should contain info on spells and mechanics (what's "true damage?")
3. Not everything should require gold. Make lvl ups free and automatic. Skills for heroes could be arranged into trees to make more possibilities to have "builds".
4. If game requires grinding, make more ways to do it and more ways to have gold. Various farms, mines, arena etc.
Could be a great game, but currently it's too raw.
Here's stupid idea that nevertheless helped me with reverse mode. Every level I read task adding "Do not". Like "Do not Deliver", "Do not Ditch" etc. If light was red I simply removed "Do not" and read description as it is. Somehow it helped me and I scored 50+ first time I tried this method. Hope this helps.
Last stage (with climbing) is really hard, but mainly because you see too few things ahead. Make it so while character flies up, he's situated to the lower part of screen, so you see dangers ahead. Currently it's too hard to dodge red balls and sawblades.
1. Coward (run from battles (~5))
2. Monk&Sinner (pray at altars, took really long)
3. Gambler (hoard money ~10-20k)
4. Hydromancer and Electromancer (get hit by water\lightning, best done constantly defending vs mages (white guys in gray tunics) while they hit you with spells)