Okay I played the game again. I suppose you're referring to the text shown in the picture below. "One snake always lies, one snake always tells the truth" is a good hint. However, I had the same text each time with the Hermes enemy.

Before the enemy transforms into the snakes, he fires blue and pink balls, but I cannot figure out which ones do damage. They are also impossible to dodge when you're up close, which is necessary to attack him.

The game doesn't register my click very frequently. This makes releasing dash attacks unpredictable. In the meanwhile, you get peppered by enemy bullets. This game is trying to be skill based. If input is ignored without feedback, you fail in your design intent.

Because this is a 2D game in a 3D environment, the game suffers from the typical problem of it being difficult to determine what will hit and what won't. This makes the player feel like they're taking hit when they really shouldn't.

There are no invulnerability frames on hit. So many a time you can get killed by a row of bullets.

Graphics are decent, but the particle systems don't match the style of the rest.

The theme is only hit when the boss has the two snakes, one of the truthful the other one not. But in the end of the day, this is a gimmick, because which is which is random.

The menu music is only 8 bars long and doesn't loop properly. There's an audible click when it restarts. The combat music is even shorter (4 bars), but it does loop OK.

I couldn't even beat the second boss (Hermes), even on easy; the game is just too difficult. I guess that you integrated the theme by having some enemy projectiles not do damage, but this does come at the cost of confusing the player and making the game more difficult.

A wonderful game. However, the style seems a little old-fashioned to me. The music is beautiful. Work on the game further! Good luck to you!