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Yes, do it! And no problem.  I'm actually believing this could be a new "Helix Jump" or "Knife Hit". You just need to make the spider movement outside of the borders by using touch-swipe feature, so it become compatible to move the character more faster, while avoiding the hits become more pleasant; you can actually make the middle border in any shape you want and the player can move along the shapes path, and also add other collision objects on the game area and then levels have way more different way to be modified.

The simple movement and avoiding to hit the bouncing ammo's makes this action phased and very clever, challenging but fun to play. The bullets maybe should hit the boss as well; maybe the boss has an armor, but still it does lose health,; and while you play, you compare your health to the bosses - just like you do in the football game and accompany your friendly team's score while comparing it to the opponent's score.

If you want to prototype fast, you may buy a ready made assets from the assets store to faster the process of development, or watch some tutorial videos of making simple hyper casual games.

Good luck there - Take it to far!