Overall, trying to understand and engaging with the mechanics was very fun for me, exploring is exciting (you never know whats behind the next corner), story and characters are a bit "meh".

I would give it 8/10!

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A bit more details follow here...

The world has many interesting themes, secrets and Mons to find. Some of them are a bit low quality but i didnt mind. Its made by one person after all and i get the vision they went for and i liked it!

This game has some very unique mechanics. For example, you can increase a stat that lets you learn attacks you witness in battle. And later on you can switch around ANY attacks between your Mons. Now, when you combine some attacks with passives it gets really crazy, for example there is a Mon with a passive ability that gets bonuses when it gets the debuff "dazed". There are some strong attacks that inflict "dazed" on yourself. But that specific Mon gets no disadvantages from it, it profits from the powerful attack AND the debuff. There are many passive abilities usually unique to every Mon and working around it feels incredibly satisfying. Sadly, it takes some time to get to the point where you have all the interesting options... it also takes some time to fully understand the battle system (i still learned things, even after 50+ hours)

I cant say much about the story... its kinda interesting i guess? I at least followed it through to the end, so its not terrible. I wish i could say more, but i dont want to leave any spoilers here. Lets just say i didnt like the build-up and introduction of a certain character in the end.