I enjoyed the game! However I didn't enjoy it as much as I thought I would, and I don't comment on games but I loved Ilya enough so I'm here to offer some of my critiques, Whether you take them into ccount or not is alright :3 it is your game afterall.
Spoilers!
The artstyle of the game is amazing, I love Ilya's and the other character's design. Especially the CGs :D the way it is drawn is so perfect considering the setting. My favorite has to be the one where he looks down at us at one of the bad ends. I get it, he's killing us but he's pretty while doing it xD
The concept of the game has me hooked, the tidbits of the lore and lies Ilya tells us is interesting. I replayed the game from the start for each route, and seeing Ilya's different responses for the same question depending on how much he trusts us: I loved it! Great attention to detail. Further reinforces that Ilya shouldn't be trusted (logically)
However my main "complaint" is that the dialogue for the MC could use some work, and the branching of the choices game too. Getting to some of the endings were hard, simply because it's hard to differentiate if the dialogue we chose was considered "trust" or "suspicious" to Ilya. Some of the choices thoroughly confused me. I thought it was being thoughtful, considerate even, but apparently it is being dismissive of Ilya. And same goes for the opposite. Like the "party" dialogue, I thought it was being rude to him but he just....blushed. Lol. The way the dialogue is written is okay, but I wish it is written more clearly if we are being sweet, dismissive or just downright aggressive towards him, so that it's easier to gauge his trust.
I like Ilya's lore but if the branching of the game for the endings is this confusing, it can be a bit of a turn off in my opinion. But that's just my opinion. I look forward to future updates of the game, because Ilya's lore has piqued my interest.