In Kero Blaster you will receive weapons when defeating bosses.

You can upgrade your stats as well as the arsenal. It's better to focus on improving the frog's health first.

Permanent upgrades also take priority, since they will make your life way easier than a simple extra life.

Never forget to replenish your health before heading into a new stage.

Don't waste your time in grinding in easier levels, as the payouts won't be as nice as if you played later stages.

Secret passages that can be accessed by walking through specific walls. Make sure to always check everything out with care in each stage so that you won't be missing any treasure.