(Disclosure: I participated in Ectocomp 2016.)
Because You're Mine is a dark little puzzler where the PC is a sapient horse searching for the ingredients for a spell to get revenge on an unfaithful lover.
The title sets the darkly romantic ambience right from the start, and the game is atmospheric and grim, while still having enough touches of black comedy to make you at least half-sympathise with the protagonist. There are some fine puzzles (I liked figuring out how to enter the swamp and get the wing), and the writing is good, given the time restrictions, though it could of course be more polished. The description of the swamp is particularly atmospheric. While the setting is pretty obviously based on My Little Pony, there is enough original worldbuilding (Brieflings, the magic) to make it a bit more than just a copy. The NPCs are obviously limited, but still get a lot of quite sympathetic characterisation in a few lines. All in all, the game is well implemented for a Petite Morte entry, including an encyclopaedia that you can consult about various topics.
So far I was enjoying both writing and puzzles. However, I got stuck on obtaining the mandrake root. I had an idea of where to find it, but the implementation was so sketchy that I nearly quit the game, before stumbling on the right phrasing.
(Spoiler - click to show)You have to type LOOK UNDER CORPSE. Commands such as LOOK UNDER TREE, SEARCH GROUND etc. will give you a stock negative response
So that brings down the score a bit for me (and if you're not familiar with real-world folklore about mandrakes, the in-game information will not be particularly helpful about where to look). However, in all other aspects the game is well-implemented, with fresh puzzles and fun worldbuilding. Recommended if you're in the mood for a dark, sardonic fantasy game with an unpleasant protagonist.