I used to have a much bigger feedback post in mind, but constant distractions delayed it to the point where the finer details have been lost. Some of this may no longer be relevant
First off: The Ancient Necro Helmet is bugged, I imagine this is because the Ancient variant was and possibly still is bugged to have mismatching bonuses with the normal variant (I found and reported this bug during my time as a tester, but dont remember its fate). It currently increases ranged by "?" instead of matching the normal helmet like it should
Secondly, fossils do not give any EXP when mined, providing little incentive to mine them. not olny that, but the pre-placed gems found in the underground ice, underground and in gem caves, do not give EXP when mined. This makes the underground ice very unrewarding, as the gems ONLY appear in this manner in that area, and in large quantities
Related to that, these rocks award gems when broken, and should award EXP to match
I feel the coin reward objects should also give some EXP, as its a rare find. Other objects which provide items when broken should similarly award EXP, notably a large bonus if your able to find an Arkhalis
Fishing seems very unbalanced EXP-wise, all the quest fish should give larger EXP rewards, yet quite a lot of the harder to catch fish...award 10 EXP as if they were Bass?
Finally for now, please redo the way the biome changing notifications work.
1. Several of the title cards are wrong or bugged, for example when you enter the Underground layer, it says youve entered the Caverns. The Caverns layer does not show when you enter it either (The Depth Metre distinctly seperates these, and there ARE harder monsters down in the Cavern layer). Also, the Underground Desert is not recognised at all, it either says your in the Desert, or the Caverns, depending on your height. Spider caverns also do not show up, although this one might be more difficult, im not sure exactly how the spider biome works. Would be nice to see what your getting into when you barge into a nest though
2. There is some confusion. When night falls, it should generally say "Forest (Night)" instead of bringing up a second "Forest" notification, it does this with rain too. Generally the biome change should show if it is night and raining or both
3. Hallow in prehardmode will show it as level 50+ despite only spawning Forest enemies, it should show the same level as Forest
4. The hardmode addendum to the old levels looks awful and is confusing, there is no going back to prehardmode once the wall of flesh is slain, so why show "Forest Level 4+ HARD level 50" for example, the old levels are irrelevant and clashes with Hallow and Underground Hallow which have no such text, being brand new HM-only biomes
I may have more to add later, if I ever finish building on my pre-HM world. Damn fishing ponds..