OPERATION PROBLEMS:
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The game doesn't play:
-Everdrive users
Update your firmware to an newer version. But also read "the game randomly locks up" below for the full picture. 

The game randomly locks up:

-Everdrive Pro users
Update your firmware.

-Everdrive N8 users:
there has been reports of recent firmware updates randomly locking up games on some (not all) setups. The general advice is having the most recent firmware, but if you keep experiencing problems, you might actually try using an older firmware version, until this issue is resolved, and be on the look for future updates on krikzz forums. 

KNOWN CRITICAL BUGS:
====================
None so far in the current release. But if you find a softlock, please take a picture or a screenshot and report it to me, and i'll see if i can find a good solution.

KNOWN NONCRITICAL BUGS:
========================
I died on the last boss.  On my next try, the different sprite parts of the boss got scrambled.
This bug seems to be isolated to if dying on a specific frame while the boss is turning.
Although unfortunate; there are a few ingame workarounds.
-getting a GAME OVER reinitializes the boss so it behaves normally again.
-if getting a GAME OVER intentionally is not acceptable, standing on the right hand side of it makes it an easier fight than to the left.

COSMETIC PROBLEMS:
===================
There are visual sprite glitches, especially on some of the bosses
-this is normal. On some frames, the game has too much to do, from the sum of features it contains. 

Some NES games are structured so that they will wait an extra frame for all updates to finish, causing half-speed slowdowns for the duration of the logic overflow. Some other games avoid this problem by accepting that the visual updates didn't get quite ready, typically leading to artifacts such as the ones you are seeing in Project Blue.  Ultimately, it is a hard design decision, and we went with avoiding slowdowns over avoiding visual glitches. 

I beat the game, but the end screen doesn't look quite like i expected it to
-we're using a rare but useful hardware trick on the end screen to bring out better yellows, tands, warm colours, and desaturated blues. It sets the R and G bits simultaneously. 

As of 2020, most emulators (and subsequently most clones) don't emulate this behaviour accurately, compared to a real NES.
As a result, the visuals will vary more or less from emulator to emulator. Some emulators have fairly passable, if different results (most versions of mesen, for example look acceptable to me, even if it's not exactly as on the NES), while others are quite off the mark (all versions of fceux, version 0.9.8 of mesen, among some others). 

We've been informed that the makers of the AVS console are aware of this and have a fix planned for their next firmware update.