Hello people I know and people I do not know, people with whom I have interacted at some point and people who happen to be here for a random reason involving boredom. I have gathered you here so I can say one thing to your face before (some of…? Anyone hopefully?) you figure it...
Don't specialise. Upgrade all of your skills as you play.
Gold hangs around for a long time so don't chase it until you've cleared a screen.
Smash stuff that looks smashable, but be ready for monsters to jump out at you.