It's a nice idea, however, with HTML being the most expensive upgrade, resulting in only around 21M being spent, the game is far too short currently. Given it 3/5 atm since it's not bad, it's just too short.
Building on CliveDouglas's strat, make sure you sell your buildings at around 800k in bank. This can mean on your 1st attempt at 1M you get under 45 minutes (I got 44min 48s) that got me an "awesome" rating for 1M gold.
The max fish quality is 153600. The chance of getting this is the same as winning euromillions twice, consecutively (and after buying 1 ticket each round)
Killing a gargoylein a boss room... I am seriously doubting if that's possible :( 14k attack archer, just can't get enough pierce shots off to deal 200k damage
The nightmares need a nerf. Can attack all, attacks twice per round, has high HP, attack and armor. The nightmares on floor 20 are stronger than the boss