finished the game some days ago, a high block and hp value is essential if you don't want to use tons of medkits. (i used 3 kits and no bombs at all).
one more tip:
If you want expensive gold items without shopping for gold, get +xx% gold items. e.g. if you want a sword for >600k, get the amulet that gives +100% gold (costs 300k). You'll collect the sword money faster and have the amulet aswell.
One thing i dislike about the game is that it does full updates only. Downloading 500mb and extracting it takes time.
Also, it gets boring quite fast (2 level building + way to the top = not very much to explore). I'd love to see more rooms or some king of random layout generator...