Wait, so is this game actually proprietary in the end (or has proprietary components)?
Hi Wuzzy! Sorry for the delayed response, I don't check the forums very often, but someone on the Solarus discord was kind enough to bring this to my attention. Yes, Ocean's Heart does have proprietary components. I appreciate your help with beta testing and I'm sorry about this misunderstanding, but it was always going to be a commercial game. I don't think I ever said otherwise, and several posts in this thread are actually regarding how there will be some assets I will freely share.
That said, the Ocean's Heart tiles that I released for free are actually included by default when you download Solarus now. Additionally, I've been working on a much bigger, more extensible, and comprehensive set of code and assets for a few years. It's designed to be used to help someone make a Zelda-like game, whereas Ocean's Heart just _is_ a game and isn't as useful.
You (and anyone else interested) can check out the free Trillium resource package here:
https://gitlab.com/maxmraz/trilliumGenerally, the features of Ocean's Heart are all added as systems here, totally rewritten to be much better and more stable. Additionally there's a whole bunch more systems I've written (like a cooking system, lighting effects, entirely new enemies, etc.). I think if you wanted to use anything from Ocean's Heart, Trillium will be much more useful for you.
If there is anything specific in Ocean's Heart that you'd like to use in creating your own game, that isn't already represented in the Trillium resources, let me know!