Micro:bit catch or loose game

main.py

from microbit import display, Image, button_a, button_b, pin0, running_time
import random


class Utils:
    @staticmethod
    def deepcopy(arr):
        return [row[:] for row in arr]

    @staticmethod
    def build_img(arr):
        result = ""
        for subarr in arr:
            for item in subarr:
                result += str(item)
            result += ":"
        return Image(result)


class Player:
    x = 2
    y = 4
    health = 9
    last_changed = running_time()
    
    def allowed_to_move(self):
        return running_time() - self.last_changed > 200
    
    def act(self, frame: Image):
        if self.allowed_to_move():
            if button_a.is_pressed():
                self.x = max(self.x - 1, 0)
                self.last_changed = running_time()
            elif button_b.is_pressed():
                self.x = min(self.x + 1, 4)
                self.last_changed = running_time()

        frame.set_pixel(self.x, self.y, self.health)
        return frame


class Enemies:
    max_enemies_count = 2
    enemies_positions = []
    last_changed = running_time()

    def allowed_to_move(self):
        return running_time() - self.last_changed > 1000

    def act(self, frame, on_hit):
        if self.allowed_to_move():
            for position in self.enemies_positions:
                position[1] += 1
                if position[1] == 4:
                    on_hit(position)
            self.enemies_positions = list(filter(lambda position: position[1] < 4, self.enemies_positions))

            if len(self.enemies_positions) < self.max_enemies_count:
                self.enemies_positions.append([random.randint(0, 4), 0])

            self.last_changed = running_time()

        for position in self.enemies_positions:
            frame.set_pixel(position[0], position[1], 5)

        return frame


empty_frame = [
    [0] * 5,
    [0] * 5,
    [0] * 5,
    [0] * 5,
    [0] * 5,
]

player = Player()
enemies = Enemies()


def on_hit(posiiton):
    if player.x != posiiton[0]:
        player.health -= 1


while True:
    new_frame = Utils.build_img(empty_frame)
    new_frame = player.act(new_frame)
    new_frame = enemies.act(new_frame, on_hit)
    display.show(new_frame)

    if player.health < 1:
        display.clear()
        display.scroll('GAME OVER!')
        break

    if pin0.is_touched():
        display.clear()
        break

Where is the blocks

@hahsbu4udhdbb could you be more specific?