Islets - All Bosses (No Damage / Hard Mode) and Ending/Post-Game Scene
All of the bosses to Islets (although I did exclude TourFrog since that's more a joke "boss" event) done hitless along with the ending and the post-game scene if you find all sixty upgrades. I assume Snoot is the true final boss for your book and movie rights after saving the islands.
It's a really well done game and I'd recommend it for something in the 8-12 hour range. It's not particularly hard but the biggest challenge is not being able to heal between save points (with few exceptions). Besides normal upgrades to health, melee and arrow damage there's secret upgrades that give randomized special effects, such as combo damage, enemies exploding on death, increased currency drops, and so forth. As you need to explore side paths to find airship parts to progress you probably will find a lot of these upgrades so full completion is pretty easy (plus there's an expensive map marker that will show where each upgrade is).
0:00 Grave Crawler
1:43 Sky Pirate
4:00 Tomb of 1000 Spirits
6:29 The Clockmaker
8:42 Buried Beast
10:16 Mecha-Rat
11:56 Forgotten Grave
15:00 GrappleBot
16:34 Runaway Plant
17:52 The Stone Witch
19:20 Swamp Frog
21:11 Defender Unit
22:37 Rogue Bot
24:29 Grave Crawlers
25:50 BoneGolem
27:20 FilthPest
29:39 GutGhoul
32:36 Ending
37:15 Credits
38:14 Post-Game Scene (after finding all 60 upgrades)
Islets can be purchased at https://store.steampowered.com/app/1669420/Islets/
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