Topaz heart:
I got a code error during my first fight in the first mission with this one. Since I'm not a super fan of fighting as defensively as this Tierramon is, I won't be trying it again.
Silver heart:
Not really a fan of fighting with this one so far. It's weird and different than the others.
I was able to capture a Tierramon (the topaz bod) on my first fight in the first mission but then on the third fight in the first mission it gave me another error when I was fighting.
My favorite Tierramon:
For the starters, I like the Obsidian heart the most followed by the Crystal heart. The Topaz one is good if you want a Tierramon that won't die and the bully move is great, just not a fan of defensive fighting myself is all. The Silver heart ... well, fighting with it was annoying (it took so much longer than the others). I like the idea of it, but fighting with it isn't really my thing. I do think capturing Tierramon and using a Silver heart to widdle down their hp is a good idea though.
Obsidian heart didn't have a one-hit kill offensive move (slightly disappointing,) but did have that health draining move (life drain I think it was called) which makes up for that. Due to how Obsidian heart fights, it makes capturing Tierramons very easy (mostly that is) and it makes for fun gameplay.
Crystal heart used to be my favorite, but not anymore. I do still like the mechanics, and using the magic and offensive moves is great, but having less defense makes it hard to keep it alive longer.
I can't wait to see if you add potions or something to heal since that would make the crystal heart a lot easier to use. Also, I'm curious to see what the items to equip to your Tierramons will do since they've been mentioned.
IIf I could save the game right now, I would start with the Obsidian heart and probably catch as many Tierramons as I can pretty easily due to its fighting style.
I did just think of something else you could add that might make things easier and more fun. During Tierramon fights, you could make the option to switch out your Tierramon for another one without having to have the first one die first. Like I mentioned in my last post with adding say the y key for telling what individual moves do, you could add say the w key to switch your Tierramon that's fighting with another that isn't (obsidian heart gets switched with silver heart for example). That would make capturing easier too. If you did that, you could have the experience split between the two Tierramon if you defeat the one you're fighting as well, which would make leveling easier too. It would also make more strategy options available too.