Just a feedback as far as I have watched:
bears: Good replay. No real complaints.
gg: Good until start of lvl 10. After that, there were only bad decisions. You got 4 elite archers (EA) and build a neo tank for 10 with about 450 gold in your hand. Correct decision: Go 7/7 instead of staying 7/7. You cannot hold lvl 10 anyway. Build small archers with the rest of the gold. You mass doomsdays instead of normal neo tanks. Neo tanks > doomsdays (will come to WHY? later). Although it is becoming clear that they wont send on 17, you keep massing them even until the end of the game (lvl 20). You leak lvl 20 with 7100 value of doomsdays.
You sell 2 of your EAs to build neo tanks or upgrade to doomsdays. This choice is really really bad, as you have no anti-mass on 20. Your doomsdays, who have 'intelligent targeting' a.k.a. targeting lowest hitpoint unit first, waste their 300+ damage on small militia instead of the 4 EAs taking care of those small fries. If you had built one less neo tank and kept those 2 EAs, which you sold, or even build about 2 more, then you could have leaked on 1 boss or so. This way you leaked 2 bosses and a demon. This is exactly why people keep sending small fries on lvls like that. So your heavy damage-dealers lose their effectivity on them. 6 EAs shoot 1 time each and all of them drop dead.
[Edit: Forgot to mention that people will have your hide for building wandigoos hehe]
hold: No real complaints, good replay. Though I didn't quite get why you'd reroll greymanes/hydra combo after they sending on lvl 13. Bears for 17, hydra for 20. And you had polar bears too. Hydras are seriously one of those units, which you can just mass and turn your brain off. At least until lvl 24. You might need some for 27 or not.
I will watch the other replays when I come back. So far it looks guddy overall. You just sometimes do some things, where I shout out loud "Noooooooooooooooooooooooooooooooooo"

But those shouldn't be too much of an obstacle, as they are learnt/avoided rather easily.
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mixup: Same as "gg". You are selling your EAs and have only 1 EA left at 20 as anti-mass. You leak all bosses and both demons and a kraken with over 7200 value. The early mix was ok. Could have pushed some earlier etc. but those aren't biggies. Please stop selling EAs

And Seer of Darkness/Fenix are only good with lotta blockers as Fenix does extra damage for each mana-point that got more. So you cannot mix them with mutants and EAs. If you had had something like TOKs as blockers or hydra, then it would have made sense. This way with I think 3 goliaths as blockers, the Fenix lost effectivity.
suicideinc: Nice income replay. But why would you wait about 20 levels before you finally upgrade your tot. Slow aura > speed aura. That gold would have been always a better use of your gold than what you did.
After 20 and 2nd you have 7/12 and about 8.5k value. Why not straight up 3 lumberjacks? You upgraded one lumberjack at each level, finally pushing 7/15 during lvl 23. Total unnecessary waste of income. You are waaaaaaaaaaay overvalued and don't need to build each round.
ygg: Bad replay imo. You place the bottom feeder in front of your ygg and even not on wall. Which leads to your BF being focused first (losing tank and damage) and your ygg going away from wall and getting surrounded faster. You could have held that easily with good placement. The rest was rather easy to play, you just wisped late.