An endless mode would be fun, plus some bosses. I've played a little more and learned to like the gameplay, but I feel like at some point it becomes just too chaotic, and personally, I would prefer something more 'strategic' like TBOI or ETG (Enter the Gungeon) which have more interactive maps and enemies.
The art is fun, and it's a big reason as to why people play this game, BECAUSE IT'S PORN, but seriously, some changes that enhance the gameplay would increase the play time and fun this product can provide.
While the point of the 'corruption' stat is to debuff your character, which pushes and motivates you to dodge the enemy attacks, I think that some kind of small 'buff' that increases with this stat would bring some interesting gameplay options.
Anyways, this game has a LOT of potential, and hopefully it can increase the ceiling when it comes to these type of games.