Have I bricked my esp32

Try Putty at 115,200 Baud

Connect with Putty

Press reset (or momentarily ground the reset pin)
The output should look like this: (but look for errors)

ets Jun  8 2016 00:22:57
rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
ets Jun  8 2016 00:22:57
rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0x00
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:QIO, clock div:2
load:0x3fff0008,len:8
load:0x3fff0010,len:1932
ho 0 tail 12 room 4
load:0x40078000,len:10012
load:0x40080000,len:252
entry 0x40080034
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>

Ground GPIO 0 pin and do a reset
The output should look like this.

>ets Jun  8 2016 00:22:57
rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
ets Jun  8 2016 00:22:57
rst:0x10 (RTCWDT_RTC_RESET),boot:0x3 (DOWNLOAD_BOOT(UART0/UART1/SDIO_REI_REO_V2)
waiting for download