It's a great game! Props to the developer to give the choice for a free download.
I've been playing the game for about 2 weeks, it's very fun, the pacing of the content is great (with minor inconveniences), amazing work on the sprites, many good things that would be too long to list.
If I had 1 thing to suggest it would be a save slot, preferably 2 save slots (1 auto save, 1 manual save). I've notice that the game auto saves whenever I quit the game or after an action been taken and there's no problem with that, keep it. However, giving another save slot for manual save gives the player a bit more flexibility and a contingency backup. The reason behind this is that it's kinda annoying whenever something undesirable happened and the knowledge needed to prevent it is not easy to find by the player or simply unknown, things like bugs happening because of certain actions, accidental misclicks maybe, or (personally) having your main digimon die because you fell asleep playing it... Yea that happened twice and that pushed me to suggest this. Now of course it's kinda against the usual mechanics of "tamagochi" games to have manual saves, also there's a possibility of abuse as well and maybe some other stuff. One of the solutions to this is maybe deleting the auto save slot if you choose to load the manual save (you probably want to give a confirmation before loading) that'll limit amount of abuse. another solution is maybe making 2 auto saves slot instead, 1 a periodically saves after a certain amount of playtime, the other is the current auto save that saves after each action, this would limit the control for the player but would still help as a contingency plan.
Now of course there might be backlash to this or maybe it's not a desirable path to take, then maybe provide a way to help mitigate the chances of a digimon dying because of AFK. Maybe give access to a autonomous feeder where it would pops food every now-and-then to help prevent hunger, and maybe as limitations it has a battery where you need to tap it to recharge it so that the digimon still needs active interaction from the player.
this comment is long enough, I'm sorry. I really enjoyed the game, really appreciate it if you take my suggestion into consideration.
Thank you!