Here's all the pro-tips in list form:
Protip #01: People die if they are killed.
Protip #02: Replenish lifespan at the Soulshrine!
Protip #03: Your HP recovers when upgrading armor.
Protip #04: If only you can Insta-kill those Dragons...
Protip #05: Press M to mute music.
Protip #06: Press S to mute sound.
Protip #07: Enemies level up each day.
Protip #08: Purchase Gold Voucher for quick wealth.
Protip #09: Press P to pause the game.
Protip #10: Use elixir to replenish your HP!
Protip #11: Dragon appears starting from Day 8.
Protip #12: Higher level, higher score
Protip #13: Need more damage? Purchase Divine Edge!
Protip #14: Believe in protips!
Protip #15: Support the developers!
Protip #16: This game doesn't suck!
Protip #17: Keep losing? Try again.
Protip #18: Perhaps you CAN win the game. Perhaps not.
Protip #19: Keep running!
Protip #20: Play STING's games. They're good.
Protip #21: Upgrade weapon to increase damage
Protip #22: There are 22 Protips in total.
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 "ELEPHANT RAVE"){kind=icon}