Downwell

Area 4 is The Limbo. Like Area 3, it has walls and floors covered with red spikes. Also, there are way fewer safe spots where you can land, meaning you can cash in very high combos, but will need to take a look where to land to get its prizes.

No enemy here can be stomped. They go up and down, and sometimes diagonally. You have "doodads" to stomp and build your combo, as well as recharge your gunboots. As said above, there are few safe grounds, so be extra careful while descending.

The best strategy here is build a 25+ hit combo, enter a cavern and exit it walking towards its ledge. It's considered an "outside area", so you'll cash in the rewards. Doing this while avoiding being hit can net you at least 2-3 hit points, or replenish the lost ones.

This is also a great area to get the combo and no-landing trophies (and maybe the no-damage ones), as there are almost no platforms to break your fall.

The trophy will unlock at the upgrade selection screen of Area 4-3.