Cute little small game, pretty straightforward and lack of features. I'm thinking of something like a catalogue where you can see all the knives you forged and those not discovered yet. Also there is not point in leveling up, maybe add a macro progression to the game?.
Finally the worst thing in my opinion are the knives designs. It's always the same model but recolored and some of them makes no sense like the sapphire knife which is RED and the description talks about unicorn stuff??
If the only point of the game is to discover new knives they have to be really appealing visually.