My personal feedback having completed the game yesterday (Spoiler Warning)
Quick: enjoyable game (quality visuals), however it would do it good if you could apply some final polish (gameplay, game's performance - great candidate for 1.0 release).
In detail:
- story and characters were mostly spot on, maybe apart from Iliana being too agreeable, not malevolent enough and too passive throughout crucial parts of the story (the nightly mirror image seems not sufficient)
- gameplay economic aspects (played on normal) are not quite well balanced - early crafting and gold squeezing is fun (supply chest could be one time use, with everything x3), but after Nyx's arrival, acceleration is too rapid, to the point where there's plenty of story left and gold is mostly useless (shop prices are marginal), there's way too many gems and some items are positively dead (ex. fragrances, gold bars / nails); pity that some unique items from shop are not used at all
- dungeon gameplay is ok, if there were more floors (generic ones) with loot more spread between them it would help balance economics a little
- portal gameplay is unfortunately weak, as said before, way too many gems, so no point in moving them when you can always reinforce; personally think queen should be attacking (with appropriate power) from the moment she finds out about moves in portal space, this would spice things up, add depth, prevent excessive stacking before enemy contact (only lost some fields on the first night) and not make Gwynn's boosts such a power creep (they could also use a little tweaking down - all of them are a bit too strong); the gold chests are not really necessary and something like extra gem after takeover would be better
- extra puzzles - first two castle maps are ok, latter are too tedious (skip button used); riddles as riddles are - hit or miss, enough simple ones to get 4 of them right, but I think other type of puzzle would be better
- other gameplay aspects - Gwynn's researches unobtainable outside of storyline shouldn't appear in menu (wasted some time getting those extra scrolls); conditions for some events are a bit too specific and obscure (using walkthrough was necessary) so they could be broadened a little (ex. longer timespan) or mirror could give some advices in that regard (and not be mute as it is right now)
- game's performance - gameplay portions and some menus lag a little (nothing too unplayable) on my laptop (low-end one, however it doesn't have trouble running more demanding titles), and unfortunately this could mean that current game code needs some optimizations or just ren'py is sub-optimal for this game (I think godot would make a great alternative); I also crashed a couple of times on scrollback and quickloads due to variable 'game_version' (or some other variation of those words, sorry didn't copy the log) being used before its declaration in some 'if' clause
Anyways, thanks for making the game and take this feedback as something to hopefully help with your future game development.