Hi! It's cool to see similar card games. I like that the game is similar to ours but focusing more on the summoning and trading creatures. The game works fine, so congrats.
The UX could be better. I understand that you had little time for the game, but here you are some feedback.
+Just starting the game I expected to be able to summon some creature. I couldn't because I had to press space to go to a different phase. Could you implement the same game without manually handling the phases? Maybe like hearthstone where you can summon and attack in any order during your turn.
+Why can I only summon 1 creature in my turn? It's not stated anywhere. I wanted to summon anything on my hand. I had the "mana".
+Life is difficult to see. Too small. It would be more familiar if the characters were in the left.
+There is no clue to see that a creature is damaged.
+Was it necessary to visually show the draw and discard pile? It doesn't affect gameplay and produces confusion. Can I draw cards there?
+The orange/brown background color was a little bit dull.
+And, as other people say, more feedback would be welcome. Zoom, movement, etc